Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba03e915983a73ef…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 20:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7028a1a5edfbdcbdcd5db4dee803a9dd SHA-1: ebf43ddd0651a7282de214afa8b70a9f58c5ef5f SHA-256: ba03e915983a73efd91f0c26225d1119d331b9680c0c0036d4475f7b1850b54b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially exploiting PDF vulnerabilities or serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134925e0a69f---13844033702.pdf In PDF document text
    • http://kmjmt.com/news/upload/file/210911113756883904w63u7z.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/51626282620.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25ee162d7---mexolowuramosipabaram.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/xizojipudifutemasesivodor.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/simevabuniwurosude.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/wixujagebagegubekad.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/kawetedupoloneminuri.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/noxovorawe.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/kosivabitinademadef.pdfIn PDF document text
    • https://megashina24.ru/files/files/kurikibubaz.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28c03778b8fe5089bc5e2d4267d0818e/50598783011.pdfIn PDF document text
    • http://gyliver.ru/files/files/16647817357.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/34757346852.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/85877991714.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fa2e9c4a18ecdcd0d4363813b904cc91/nupebixifo.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/20860170400.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381dd7c7534---29290614762.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/vevofofafolebujaboz.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/gadaxojuso.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5c8ae510---61575185553.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/viwafugaxujigexusezavijal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=harriet+beecher+stowe+uncle+tom%27s+cabin+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 11236 bytes
SHA-256: 65bdb108a3870ae6ca71036c2e553e4dcbdf1da12e5d6a8c4070eddd71081588
font_02_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 15012 bytes
SHA-256: adef76d7c51e23dcf4f6e4641d365d551172723b49e7265cab5d2ee24126ad80

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